This past August Harlem Bespoke featured an 1889 photo of Morningside Park's 116th St. stairs. The photo is a cyanotype in the collections of the Museum of the City of New York. A week after the photo appeared on Harlem Bespoke I put up a leaf-obscured view of the stairs. I took another picture this morning with far fewer leaves, but still lots of branches, present.
Construction on the park began in 1883. The park was still several years from completion when the photo was taken in 1889. The Carl Schurz monument was added at the top of the stairs in 1913 (Andrew Carnegie was there!). The apartment houses under construction on Morningside Avenue are still there today.